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Optolong OIII 3nm filter 2"
Optolong's OIII 3 nm narrowband filter passes a 3 nm band centred on 500 nm (the OIII 495.9/500.7 nm lines) for planetary nebulae, supernova remnants and bicolour or Hubble-palette work with monochrome cameras.
Specifications
Format
2" mounted
Bandwidth
3 nm
Centre wavelength
500 nm
Use
Monochrome CCD/CMOS cameras and modified DSLRs
Coating
Multi-layer anti-reflection coating on a non-cemented substrate, applied by ion-assisted deposition for durability and a stable centre wavelength with temperature.
Manufacturer documentation
Optolong OIII 3nm 2"
Compatibility notes Single 2in mounted 3nm filter from the SHO-3nm range.
Additional specifications
Reference
73722
Data sheet
Bandwidth
3 nm
Format
2" mounted
Use
Monochrome CCD/CMOS cameras and modified DSLRs
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Optolong OIII 3nm filter 2" Optolong's OIII 3 nm narrowband filter passes a 3 nm band centred on 500 nm (the OIII 495.9/500.7 nm lines) for planetary nebulae, supernova remnants and bicolour or Hubble-palette work with monochrome cameras.
Manufacturer model: Optolong OIII 3nm 2" · Specifications checked against manufacturer data on 2026-11-03